package com.mmlc.meimei.lichengkongjian.customview;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by OutSide on 2017/1/19.
 */

public class LabelFlowLayout extends ViewGroup{
//    private static final int PADDING_HOR = 0;//水平方向padding
//    private static final int PADDING_VERTICAL = UIUtils.px2dp(21);//垂直方向padding
//    private static final int SIDE_MARGIN = UIUtils.px2dp(31);//左右间距
//    private static final int TEXT_MARGIN = UIUtils.px2dp(31);
//    /**
//     * @param context
//     */
//    public LabelFlowLayout(Context context) {
//        super(context);
//    }
//
//    /**
//     * @param context
//     * @param attrs
//     * @param defStyle
//     */
//    public LabelFlowLayout(Context context, AttributeSet attrs, int defStyle) {
//        super(context, attrs, defStyle);
//    }
//
//
//
//    /**
//     * @param context
//     * @param attrs
//     */
//    public LabelFlowLayout(Context context, AttributeSet attrs) {
//        super(context, attrs);
//    }
//
//    @Override
//    protected void onLayout(boolean changed, int l, int t, int r, int b) {
//        int childCount = getChildCount();
//        int autualWidth = r - l;
//        int x = SIDE_MARGIN;// 横坐标开始
//        int y = 0;//纵坐标开始
//        int rows = 1;
//        for(int i=0;i<childCount;i++){
//            View view = getChildAt(i);
//            int width = view.getMeasuredWidth();
//            int height = view.getMeasuredHeight();
//            x += width+TEXT_MARGIN;
//            if(x>autualWidth){
//                x = width+SIDE_MARGIN;
//                rows++;
//            }
//            y = rows*(height+TEXT_MARGIN);
//            if(i==0){
//                view.layout(x-width-TEXT_MARGIN, y-height, x-TEXT_MARGIN, y);
//            }else{
//                view.layout(x-width, y-height, x, y);
//            }
//        }
//    };
//
//    @Override
//    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//        int x = 0;//横坐标
//        int y = 0;//纵坐标
//        int rows = 1;//总行数
//        int specWidth = MeasureSpec.getSize(widthMeasureSpec);
//        int actualWidth = specWidth - SIDE_MARGIN * 2;//实际宽度
//        int childCount = getChildCount();
//        for(int index = 0;index<childCount;index++){
//            View child = getChildAt(index);
//            child.setPadding(PADDING_HOR, PADDING_VERTICAL, PADDING_HOR, PADDING_VERTICAL);
//            child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
//            int width = child.getMeasuredWidth();
//            int height = child.getMeasuredHeight();
//            x += width+TEXT_MARGIN;
//            if(x>actualWidth){//换行
//                x = width;
//                rows++;
//            }
//            y = rows*(height+TEXT_MARGIN);
//        }
//        setMeasuredDimension(actualWidth, y);
//    }


    public LabelFlowLayout(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
    }

    public LabelFlowLayout(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public LabelFlowLayout(Context context)
    {
        this(context, null);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {

        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        // 如果是warp_content情况下，记录宽和高
        int width = 0;
        int height = 0;

        // 记录每一行的宽度与高度
        int lineWidth = 0;
        int lineHeight = 0;

        // 得到内部元素的个数
        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++)
        {
            // 通过索引拿到每一个子view
            View child = getChildAt(i);
            // 测量子View的宽和高,系统提供的measureChild
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            // 得到LayoutParams
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            // 子View占据的宽度
            int childWidth = child.getMeasuredWidth() + lp.leftMargin
                    + lp.rightMargin;
            // 子View占据的高度
            int childHeight = child.getMeasuredHeight() + lp.topMargin
                    + lp.bottomMargin;

            // 换行 判断 当前的宽度大于 开辟新行
            if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight())
            {
                // 对比得到最大的宽度
                width = Math.max(width, lineWidth);
                // 重置lineWidth
                lineWidth = childWidth;
                // 记录行高
                height += lineHeight;
                lineHeight = childHeight;
            }
            else
            // 未换行
            {
                // 叠加行宽
                lineWidth += childWidth;
                // 得到当前行最大的高度
                lineHeight = Math.max(lineHeight, childHeight);
            }
            // 特殊情况,最后一个控件
            if (i == cCount - 1)
            {
                width = Math.max(lineWidth, width);
                height += lineHeight;
            }
        }
        setMeasuredDimension(
                modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
        );

    }

    /**
     * 存储所有的View
     */
    private List<List<View>>    mAllViews   = new ArrayList<List<View>>();
    /**
     * 每一行的高度
     */
    private List<Integer>       mLineHeight = new ArrayList<Integer>();

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b)
    {
        mAllViews.clear();
        mLineHeight.clear();

        // 当前ViewGroup的宽度
        int width = getWidth();

        int lineWidth = 0;
        int lineHeight = 0;

        // 存放每一行的子view
        List<View> lineViews = new ArrayList<View>();

        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++)
        {
            View child = getChildAt(i);
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            // 如果需要换行
            if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight())
            {
                // 记录LineHeight
                mLineHeight.add(lineHeight);
                // 记录当前行的Views
                mAllViews.add(lineViews);

                // 重置我们的行宽和行高
                lineWidth = 0;
                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
                // 重置我们的View集合
                lineViews = new ArrayList<View>();
            }
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
                    + lp.bottomMargin);
            lineViews.add(child);

        }// for end
        // 处理最后一行
        mLineHeight.add(lineHeight);
        mAllViews.add(lineViews);

        // 设置子View的位置

        int left = getPaddingLeft();
        int top = getPaddingTop();

        // 行数
        int lineNum = mAllViews.size();

        for (int i = 0; i < lineNum; i++)
        {
            // 当前行的所有的View
            lineViews = mAllViews.get(i);
            lineHeight = mLineHeight.get(i);

            for (int j = 0; j < lineViews.size(); j++)
            {
                View    child = lineViews.get(j);
                // 判断child的状态
                if (child.getVisibility() == View.GONE)
                {
                    continue;
                }

                MarginLayoutParams lp = (MarginLayoutParams) child
                        .getLayoutParams();

                int lc = left + lp.leftMargin;
                int tc = top + lp.topMargin;
                int rc = lc + child.getMeasuredWidth();
                int bc = tc + child.getMeasuredHeight();

                // 为子View进行布局
                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.leftMargin
                        + lp.rightMargin;
            }
            left = getPaddingLeft();
            top += lineHeight;
        }

    }

    /**
     * 与当前ViewGroup对应的LayoutParams
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs)
    {
        return new MarginLayoutParams(getContext(), attrs);
    }

}
